14
Chapter 2
IV.
Basic Application Information
for Hermetic Compressors
Tecumseh hermetic compressors are engineered to
do specific air conditioning and refrigeration tasks.
Hermetic compressors are designed for a particular
evaporator temperature range and a specific refriger-
ant.
A. Evaporator Temperatures
The key specification is the evaporator temperature
of the system. Compressors which are operating out-
side their design evaporator temperature range can
be expected to have poor pumping efficiency and
experience motor problems.
Tecumseh hermetic compressors are designed for
one of the following evaporator temperature ranges
shown in Table 2-2.
B. Refrigerant
Use only the serial label refrigerant when charging
the system. Using a different refrigerant can lead to
excess system pressure, damage to the compressor
and an explosion. For example, using R-502 in a
compressor designed for R-12 can lead to higher
operating pressures that can overload the bearings
and overwork the motor. Use of a refrigerant other
than the serial label refrigerant will void the com-
pressor warranty.
Table 2-2:
Evaporator Temperature Ranges
Application
Approved Evaporator
Temperatures
Air Conditioning
+32
º
F to +55
º
F
Improved Performance Air Conditioning
+32
º
F to +57
º
F
Heat Pump (Approved Models)
-15
º
F to +55
º
F
High Evaporator Temperature
+20
º
F to +55
º
F
Medium Evaporator Temperature
-10
º
F to +30
º
F
Low Evaporator Temperature
(Normal Torque Motor)
-30
º
F to +10
º
F
Low Evaporator Temperature
(High Torque Motor)
-40
º
F to +10
º
F
Commercial
0
º
F to +50
º
F
